"The way police and administration have been politicised ...I was not allowed to address election meetings and obstacles were created," he told reporters in Gorakhpur.
"We have won both Noida and Lucknow where I campaigned," he said, adding his focus was on "development and Hindutva issues" during electioneering.
BJP's star campaigner said, "Campaigning is important in any election, but results depend upon how tickets are distributed and what is the organisational structure.
Adityanath said, "I feel that a review of ticket distribution and strategy is important. Whether it is victory or defeat, it motivates a person to introspect. We will review everything and talk to the high command."
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Of the 11 Assembly seats that went to polls, BJP won only three. The party had won all these seats last time. Adityanath said he was allowed to campaign only for three days and during that period too the state government created problems for him.
He accused the state government of influencing the outcome of the bypolls and said, "State ministers were openly flouting the Model Code and misusing the official machinery."
After a near-total sweep in Lok Sabha polls in Uttar Pradesh, BJP bit the dust in eight of the 11 Assembly seats where bypolls were held Saturday. Besides Lucknow East and Noida, the party won Saharanpur (City).
"The responsibility of defeat is mine and my team's. The reasons behind the defeat will be reviewed. It has given us a lesson for Vidhan Sabha polls," he said.